| Custom Homes Builders | Custom Homes Builders | — | (650) 726 7477 | GC, remodel, ADU | Half Moon Bay · San Mateo County | — | — |
| Custom Homes Of Woodside INC | Steven Joseph Peterson | — | (650) 743 7285 | GC, remodel, ADU | Woodside · San Mateo County | — | — |
| Custom Sheet Metal & Rain Gutter Systems INC | Carlos Ramon Lopez Santos | — | (415) 410 8015 | Other | South San Francisco · San Mateo County | — | — |
| Custom Tinting By The Tint Guy | Seth Louis Gladstone | — | (650) 678 9412 | Other | San Carlos · San Mateo County | — | — |
| Customized Electrical Services | Vidana Josue | — | (650) 274 8442 | Electricians | Burlingame · San Mateo County | — | — |
| Cuzick James Construction INC | Trevor Wyatt Cuzick | — | (650) 380 9004 | GC, remodel, ADU | Half Moon Bay · San Mateo County | — | — |
| Cw General | Cw General | cwgeneralconstruction@gmail.com | (415) 860 9083 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Cy Construction LLC | Collin Yu | — | (415) 272 3584 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Cynergy Group INC | Daniel Phang | — | (650) 489 5799 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Cypress Coast Construction | Brian Francis Jenny | cypresscoast@yahoo.com | (650) 726 1878 | GC, remodel, ADU | El Granada · San Mateo County | — | — |
| D & A Builders INC | Dmitri Anatolievich Laktionov | — | (415) 846 1353 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| D & J Tile Company INC | David Bret Newman | info@djtile.com | (650) 632 4000 | Other | San Carlos · San Mateo County | — | — |
| D & K Construction & Painting Company INC | Evangelos Teodoros Dokos | — | (650) 589 4984 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| D & R Construction | Daniel Joseph De Nardi | — | (650) 455 3326 | GC, remodel, ADU | So San Francisco · San Mateo County | — | — |
| D A Painting | D A Painting | — | (650) 416 4371 | Windows, patio, painters | San Carlos · San Mateo County | — | — |
| D A Pope Incorporated | Robert Michael Bybee | — | (650) 349 5086 | GC, remodel, ADU | Foster City · San Mateo County | — | — |
| D B Electric | David Christian Bossler | — | (415) 351 8846 | Electricians | Pacifica · San Mateo County | — | — |
| D B Electric | David Phillip Baldi | — | (650) 303 6382 | Electricians | San Carlos · San Mateo County | — | — |
| D B Lighting And Integration | D B Lighting And Integration | — | (415) 351 8846 | Electricians | Pacifica · San Mateo County | — | — |
| D C Lim Construction | Demetrio Calimag Lim | — | (650) 515 9777 | Electricians | Daly City · San Mateo County | — | — |
| D C Lock & Security INC | Michael Paul Sink | — | (650) 992 2451 | Alarm and generators | Daly City · San Mateo County | — | — |
| D Cornerstone Construction INC | Eduardo Javier Duarte Murillo | — | (415) 632 2401 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| D E A Security Systems Co INC | Drake Elliott Allen | — | (650) 508 0199 | Electricians | Belmont · San Mateo County | — | — |
| D E Bagnani Construction | Douglas Edward Bagnani | — | (925) 895 6659 | GC, remodel, ADU | Woodside · San Mateo County | — | — |
| D F Design & Construction | Donald Alfred Farrelly | — | (650) 302 7373 | GC, remodel, ADU | Emerald Hills · San Mateo County | — | — |
| D G Floor Coverings INC | Dennis Edward Gasper | dg@dgfloorcoverings.com | (650) 299 1676 | Other | Redwood City · San Mateo County | — | — |
| D J Capps Glass Co | David Russell Capps | — | (650) 344 5155 | Windows, patio, painters | Burlingame · San Mateo County | — | — |
| D J Mc Cann Construction | David John Mc Cann | — | (650) 465 2635 | GC, remodel, ADU | Montara · San Mateo County | — | — |
| D J Mc Cann Construction INC | David John Mc Cann | — | (650) 465 2635 | GC, remodel, ADU | Half Moon Bay · San Mateo County | — | — |
| D K Construction | Katics Dezso | — | (650) 868 5755 | GC, remodel, ADU | Emerald Hills · San Mateo County | — | — |
| D K M Plumbing | D K M Plumbing | — | (415) 309 7514 | Other | San Bruno · San Mateo County | — | — |
| D L Fan Services And Balancing | David George Loutzenheiser | — | (650) 348 4976 | HVAC | Burlingame · San Mateo County | — | — |
| D L R Construction | Don Louis Raffo | — | (415) 990 1505 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| D M B Plumbing | D M B Plumbing | — | (415) 740 2326 | Other | San Bruno · San Mateo County | — | — |
| D Marchetti Construction | Diego Nicolas Marchetti | — | (650) 346 3386 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| D O T Construction | David Francis O'toole | — | (650) 271 5988 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| D P C Design Construction | Daniel Paul Coupland | — | (650) 400 8268 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| D P M Property Management INC | David Bruce Dollinger | — | (650) 508 8666 | Electricians | Redwood City · San Mateo County | — | — |
| D R Construction & Electrical | Rashidi Davood | — | (650) 520 1191 | Electricians | Burlingame · San Mateo County | — | — |
| D Starr Construction | Desire Starr De Vaul | — | (707) 315 2038 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |